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annotate org.eclipse.core.databinding.observable/src/org/eclipse/core/databinding/observable/set/ListToSetAdapter.d @ 95:6208d4f6a277

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Added trees for databinding.beans and observable
author Frank Benoit <benoit@tionex.de>
date Tue, 21 Apr 2009 10:55:51 +0200
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children b74ac5dfcc06
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11
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12 package org.eclipse.core.databinding.observable.set;
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13
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14 import java.util.HashSet;
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15 import java.util.Set;
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16
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17 import org.eclipse.core.databinding.observable.Diffs;
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18 import org.eclipse.core.databinding.observable.Realm;
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19 import org.eclipse.core.databinding.observable.list.IListChangeListener;
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20 import org.eclipse.core.databinding.observable.list.IObservableList;
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21 import org.eclipse.core.databinding.observable.list.ListChangeEvent;
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22 import org.eclipse.core.databinding.observable.list.ListDiffEntry;
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23
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24 /**
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25 * Observable set backed by an observable list. The wrapped list must not
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26 * contain duplicate elements.
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27 *
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28 * <p>
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29 * This class is thread safe. All state accessing methods must be invoked from
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30 * the {@link Realm#isCurrent() current realm}. Methods for adding and removing
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31 * listeners may be invoked from any thread.
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32 * </p>
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33 *
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34 * @since 1.0
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35 *
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36 */
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37 public class ListToSetAdapter : ObservableSet {
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38
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39 private final IObservableList list;
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40
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41 private IListChangeListener listener = new class() IListChangeListener {
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42
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43 public void handleListChange(ListChangeEvent event) {
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44 Set added = new HashSet();
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45 Set removed = new HashSet();
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46 ListDiffEntry[] differences = event.diff.getDifferences();
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47 for (int i = 0; i < differences.length; i++) {
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48 ListDiffEntry entry = differences[i];
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49 Object element = entry.getElement();
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50 if (entry.isAddition()) {
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51 if (wrappedSet.add(element)) {
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52 if (!removed.remove(element))
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53 added.add(element);
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54 }
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55 } else {
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56 if (wrappedSet.remove(element)) {
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57 removed.add(element);
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58 added.remove(element);
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59 }
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60 }
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61 }
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62 fireSetChange(Diffs.createSetDiff(added, removed));
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63 }
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64 };
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65
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66 /**
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67 * @param list
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68 */
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69 public this(IObservableList list) {
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70 super(list.getRealm(), new HashSet(), list.getElementType());
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71 this.list = list;
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72 wrappedSet.addAll(list);
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73 this.list.addListChangeListener(listener);
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74 }
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75
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76 public synchronized void dispose() {
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77 super.dispose();
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78 if (list !is null && listener !is null) {
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79 list.removeListChangeListener(listener);
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80 listener = null;
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81 }
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82 }
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83
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84 }